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EM-drive don't die

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 EM-drive don't die

RF-resonant cavity thruster or the famous electromagnetic drive or the electron or radio wave engine is not dying.  What is so special in the EM-drive? The thing that makes the EM-drive very interesting in this engine is that the radio- or microwave is the thing that is thrusting the spacecraft. 

The EM-drive is a multipurpose tool. It can use to transport the spacecraft, but it can also be a weapon. The microwave that will push the spacecraft ahead can also destroy other spacecraft, and this kind of system can install in the miniature combat shuttles. 

The reason why DARPA is interesting about this kind of system is that it can place things like combat space shuttles, which are equipped with nuclear weapons far away from Earth, and if the time comes, those shuttles can call to attack. In the worst situations, the combat shuttle is a miniature space shuttle where is internally stored nuclear warhead. 

After the strike command, the shuttle starts to glide against its target. Then the nuke inside them will be detonated. The EM-drive would make it possible to hide the infrared signal of the ignition of the engines, and then the microwave can also be used to attack against satellites and it can defend the shuttle against ASAT weapons. 

The idea of the EM-drive is similar to the photon rocket, but the difference is that EM-drive can use things like water or hydrogen for increasing its thrust. In theory, the spacecraft can use the electromagnetic drive also in the atmospheric flight, which means that when the craft requires more thrust it can increase the power by injecting the hydrogen or some other propellant in the firing chamber. 

So when the microwave hits to the low-temperature propellant, that propellant will be acting the same way as the normal burning situation. But the thing is that in this case the hydrogen doesn't require oxygen, and the system can operate a longer time. 

The difference between the regular rocket and EM-drive is that the specific impulse of the micro- or radio wave is near the speed of the light. And that means that if the craft would travel to space by using the hydrogen booster, the craft can continue the mission at the solar system. So the EM-drive can operate by using the microwave system in the solar system, and the craft can collect more propellant from the atmospheres of the gas giants. 

But the thing is that the EM-drive doesn't require propellant in the space. The reason why it would use propellant is that the thrust of the micro- or radiowaves is very low. And the extra propellant would help the craft to accelerate the speed more effectively at the beginning of the flight. The EM drive makes it possible to send smaller spacecraft to the missions because it would not need the fuel during the flight. 


Sources: 


EM-drive- https://en.wikipedia.org/wiki/RF_resonant_cavity_thruster


https://www.popularmechanics.com/space/rockets/a33917439/emdrive-wont-die/


Image: https://www.popularmechanics.com/science/a24745/science-behind-em-drive/

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